avrcameramicrocontrollerttl
I am having trouble interfacing a VC0706 Camera with only an AVR Microcontroller. I am using simple serial communication but the camera does not respond. I tried connecting it with a computer but still no response from the camera.
Moreover I am having difficulty in understanding the following:
Your block daigram shows no relationship between the Oscillator/Divider and the Waveform generator, but these must be optimized for synchronous mixing.
Can you try a simple approach?
To mix the the sine input and output, may I suggest the classic 180deg range XOR mixer which is commonly known as a Type I PLL phase detector. The inputs are the same frequency and the output is the difference phase and sum frequency ( + harmonics) so a LPF must be chosen to easily suppress the 2f components yet provide fast tracking of phase vs voltage.
let R1C1 = R2C2 = R3/C3 = 1000/f = 1000/250KHz = 4ms
let R1 = 1~10 MΩ, Let R3 ~ 1KΩ to drive ADC
use buffered inverters '04 and '86 XOR
Average ADC readings to achieve desired resolution and noise reduction by √n samples.
What I usually do is I try to ensure that the controller doesn't send commands faster than the robot can process. Sending instructions consistently faster than can be processed by the robot will always eventually result in a loss of information with either a FIFO or a LIFO buffer. As a backup to intermittent lag on the robot I would use a small FIFO buffer. The exact size depends on what the trade-off between lost commands vs. responsiveness.
a LIFO buffer really doesn't make much sense in any case because you'll end up with an out of order operation in case the robot responds to commands slowly. consider the following:
With a LIFO structure, say all the commands get sent before the robot gets time to process any commands. The commands are now going to be executed in reverse order! The robot will activate servo 2, drive back, activate servo 1, then drive forward. Most likely this is never what you want.
If you're only ever processing the latest instruction, then no additional buffer would be needed at all.
Best Answer
Usualy, the connetion in serial problems are due to difference in speed communication, CRC, odd or even parity, etc. So check if the configuration are the same.
No, I don't think you can store one image in the SRAM of the microcontroler. If the image resolution is 640x480, then you will need at least 640*480=307200=307kb to store a black and white image. It is larger than the SRAM of the microcontroler (2kb).
I is also a large memory for a single microcontroler, then you'll need to add an external RAM, as large as the microcontroller's pins allow addressing.
Hope I could help you.